To start off: I came across this when typing 'Expletus Sans' (my typeface) in google. I really like the work it features and, off coarse, it feels great to see my own typeface among such beautiful things.

http://laymanslayout.wordpress.com/

http://www.ilovetypography.com

http://fontsinuse.com/

additionally to the ones from Jonathan I read:
http://fontfeed.com/
http://blog.myfonts.com/
http://typographica.org/
http://typischbeton.wordpress.com/

in German:
http://www.fontblog.de
http://typefacts.com/
http://www.slanted.de/
http://www.spatium-magazin.de
http://26plus-zeichen.de

from type designers:
http://spiekermann.com/
http://www.typeoff.de/

and less type specific:
http://www.swiss-miss.com/
http://www.manystuff.org

and one more in German:
http://www.typolution.de/